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When answering a query, named should never attempt to add the same RRset to the ANSWER section more than once. However, such a situation may arise when chasing DNAME records: one of the DNAME records placed in the ANSWER section may turn out to be the final answer to a client query, but there is no way to know that in advance. Tweak the relevant INSIST assertion in query_respond() so that it handles this case properly. qctx->rdataset is freed later anyway, so there is no need to clean it up in query_respond().
dde95871